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Explain the Two-Step View pattern with an example in PHP

The Two-Step View is a design pattern used in web development to separate the presentation logic into two steps. This helps achieve a cleaner and more maintainable codebase by separating content generation from its presentation.

In the Two-Step View pattern, the view is split into two parts:

  1. Template: This is responsible for generating the raw content of the view. It typically contains placeholders or markers for dynamic data.
  2. Layout: This is responsible for the presentation and structure of the view. It includes the HTML markup, CSS styles, and any other presentational elements.

Let’s understand with an example:

Assume you have a simple web application in PHP that displays information about a user. The Two-Step View pattern can be implemented as follows:

Template (product_template.php):

Layout (layout.php):

Controller (index.php):

Here is an example that shows:

  • The product_template.php file is responsible for generating the product details.
  • The layout.php file is the overall structure of the page.
  • The index.php file acts as the controller, including the template and layout to render the final view.

This separation makes it easier to update the layout without modifying the template, and vice versa. It also promotes code reusability and maintainability in larger applications in PHP.



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